binder: add compat getCallingUidEv symbol

Fixes lg ril :
E/RILD    (27586): dlopen failed: dlopen failed: could not load library "liblgdrm.so" needed by
 "libril-qc-1.so"; caused by cannot locate symbol "_ZN7android14IPCThreadState13getCallingUidEv"
  referenced by "liblgdrm.so"...

Change-Id: I1e27583ec4b08147d31cb1976ea49336e451e0b6